Troubled Waters: Red Tides and Other Algae Blooms. Large-scale agriculture, factories and other sources produce chemical runoffs. These nutrient loadscan accumulate in waters and cause harmful algae blooms (HABs) including the red tides that are increasingly common. Algal blooms are now occurring in every coastal state in the U.S., and are a major concern around the world. HABs affect the health of marine organisms and also people. Dr. Glibert explains the vital role of algae in marine ecosystems, how runoff toxins cause the unnatural algal blooms, and what must be done to stop the damage. She also discusses how ocean geoengineering can impact algae. Patricia Glibert, PhD, Professor, Center for Environmental Science, University of Maryland

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